sh: Reclaim TIF_DEBUG.

This was used by the old hw-breakpoints API, but now there is nothing
is using it anymore, so just kill it off.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/thread_info.h

@@ -118,7 +118,6 @@ extern void free_thread_info(struct thread_info *ti);
 #define TIF_SECCOMP		6	/* secure computing */
 #define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
 #define TIF_SYSCALL_TRACEPOINT	8	/* for ftrace syscall instrumentation */
-#define TIF_DEBUG		9	/* uses UBC */
 #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		18
 #define TIF_FREEZE		19	/* Freezing for suspend */
@@ -131,7 +130,6 @@ extern void free_thread_info(struct thread_info *ti);
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
-#define _TIF_DEBUG		(1 << TIF_DEBUG)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_FREEZE		(1 << TIF_FREEZE)